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please answer fast and give a detailed solution too.

Harsh Raj , 7 Years ago
Grade 11
anser 1 Answers
Ritesh Khatri

Last Activity: 7 Years ago

Using Identity Sinx = Cos(90-x) we can write
(cos20 – cos(90-20))/(cos20 + cos(90-20))
 
which is equal to
(cos20 – cos(70))/(cos20 + cos(70))
 
Now using transformation formula we get
 
[-2Sin45Sin(-25)]/[2cos45Cos25]
 
which gives Tan25

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